Examine source code of Tab Sticky Notes

{
  "manifest_version": 2,
  "name": "Tab Sticky Notes",
  "version": "1.0",
  "description": "Adds a sticky note to each tab.",
  "icons": {
    "48": "icons/note-48.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/note-48.png",
    "default_title": "My Tab Note",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e600c2c-8efc-4d11-b674-593199d2b1ae}"
    }
  }
}